Air heater and retarder



, E. H. SWIFT AIR HEATER AND RETARDER med Dec. 22, 1.922

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Suva/nto@ 660% Pafenied'Feb. 22,1927. .Y

. VEDWIN Hfs/wirr, or Bin'ioKLYn, Nnwfronn. 'y

AIR iriinfinnY .man gewannen.

Application led December 22, 1922.7.;Sera1 No. 608,518.V

This invention relates to an air heater and retarder. Y v v Its object is the production of a device, by means of whichheated air isVv supplied to the unconsuined products of coinbustionfof the fuell of a furnace,to obtain complete coinbustion. A sec-ond object of the. device is to'provide heatedair tothe burning fuel of a furnace, at a velocity of inflow, by means 1o of which the oxygen of the inflowing air will all combine with the unconsumed gases generated, and therefore not chill the bed of fuel. A thirdobject of the invention is the production of means whereby Vall portions of an inflow of air to a furnace is heated before mixing with the gases generated therein. A fourth object of the invention is to prevent the escape `|of obnoxious gases from the combustion chamber of a furnace. In the accompanying` drawings Fig. l represents a side view ofcan exeinpliiication of the air heater and retarder applied to a furnace; Fig. 2 shows an enlarged side view of the heater and retarder; Fig. 3 indicates a left hand side view of Fig. 2; Fig. 4 shows a section on the line 4, 4 ofF ig. 3 and Fig. 5 represents a section on the line 5, 5 of Fig. 4.

The air heat-er and retarder-comprises an induction tube, consisting of vanouter portion designated in its entirety by the letter A, and the inner portion designated in its' entirety by the letter B. A lretarding coil designated in its entirety by the letter' C, isy

detachably fastened within the inner portion B. y, f Y

The portion A of the induction tube has formed therewith the flared or nozzle shaped inlet end 20, and the flange 2l with the openings 22 at its other end. A tapered seat23 in the portion A extends forwardly 'from the flange 2l. Afdamper 28 is located in the portion A and is supported onk the spindle 29, the ends of which are journaled in the opposite sides of said porti-on A. An

- operating knob 30 is fastened to one end of'V the spindle 29, and an arm 3l with .the eX- tension 32 is fastened to the other end of the said spindle. y A

The portion B of the induction tube at one end has formed therewith the tapered end 34, and atthe other end of the portion B is formed the flared or nozzle'shaped out# let end 35. The tapered end 34 of the portion B is normally seated on Vthe tapered seat 23 of the portion A, and a pin 36 ex-v tendsthrough openings in the portions A and B to lock them` to each other. Y

The retarding Vcoil C consists, in this in-V stance of av core, consisting of a pair of wires 88 and 39 wound* to each other, andwith 7' which is formed at one end an eye40.

A' coil, Vand in this instance l"a double threaded coil consisting of a series of rings' 44 etending` from said core, follow each other in a helical direction through the por-t`l r tion B of the induction tube. The `pin 36 yextends through the eye 40. The rings 44 plurality of in its entirety by the letter F and Vcomprises,

the combustion chamber 45,V the grate 46, the front wall'47, therear wall48 and the ash pit 49. They furnacedoor 50 has fastened thereto the vair heater a-nd retarder. The portion A is located on the outside of said door with the flange 2l fastened thereto by means of the screws 57, and the portion B extends from the inside face of the door 50, to theinside face of the wall 47, notto be in the direct heat zone of the 'chamber 45, and which prevents the heaterand retarder being injured by the heat of the furnace.

To use the air heater and retarder, the

`damper, 28 in the portion A of the induction tube, is located vto permit the required volume of air to flow into the chamberV 45 at the required velocity. As the air flows through the portion B of the induction tube a portion is retarded and twirled in various Vdirections bym-sans of the coil C and at the saine time a direct flow is given to another portion of the air flowing through the tube. By this means the air is thoroughly heated throughout all portionsv thereof'before it enters the furnace and is in proper condition for the combination of its oxygen with kthe unconsuined gases of the products of combustion. By this means perfect combustion is vobtained with a great saving of fuel and obnoxious gases are prevented from escaping from the furnace.

Having described my invention, what I desire toksecure by LettersPatent andclaiin is:

'In an air heater and retarder the combina-V tion of an Vinduction tube comprising an outer portion with a flange at one end thereof and a tapered seat at said end, an inner portion for said tube with a tapered end seated in the tapered seat of the outer portion, a detachable pin extending through enable the easy wthdrmvul of said eore from the tube.

Signed at the borough of Manhattan, city 1U of New York,Y n the county o New York und Stute of New York this 2nd dey of Deeen'rber EDWIN H. SWIFT. 

